4O4 NEW YORK STATE MUSEUM 
d Teieith antennal segment with the stems subequal, each with a length 
2% and 3% times the diameter ; abdomen yellowish brown, length 
TOTTI eee ete re (CCeidoOmyia) wilvets Mek, C, wo, S38 
cc Dorsal plate short, broadly and triangularly emarginate 
d Fifth antennal segment with the stems equal, each with a length 
2¥2 times the diameter; abdomen dark red, length 1 mm........ 
(Cecidomyia) fraxini Felt, C. 179 
bbb Ventral plate rather short, broad 
c Dorsal plate rather long, broad, deeply and triangularly emarginate 
d Basal clasp segment with a rounded lobe basally; abdomen yellowish 
brown, length I mm..(Cecidomyia) acerina Felt, C. 149 
dd Basal clasp segment without a basal lobe internally; abdomen light 
yellowish brown, length I mm........ ESMOStrA it Sd, C. OAT 
cc Dorsal plate rather long, narrowly incised 
G ANKCOANKS THHTCOUS, Iensln 4/8 Was ccoocoo OWSCHTA im Sd C, 300 
bbbb Ventral plate rather short, narrow, narrowly rounded apically 
c Dorsal plate short, broadly and triangularly emarginate 
d Fifth antennal segment having the basal portion of the stem with 
a length 34 its diameter or less 
e Abdomen yellowish or dark carmine, length 1 mm; third palpal 
Seameme: GAAP 550 oc0000000000 i line, Ieke, (Cy aiy77s. 82. 
ee Abdomen reddish brown, length I mm; third palpal segment 
lbyronallhy Oe... (CSCIGOmyis) macroriula Iehr, C, 1023 
aa Ventral plate truncate 
b Dorsal plate short, deeply and triangularly incised; abdomen pale 
yellowish, length .5 mm; bred from heads of curled sumac leaves.... 
TIMOVMA im, So. C, ar7aon 
bb Dorsal plate very short, deeply and narrowly emarginate, length 1 mm; 
bred from rolled elder leaves...sambucifolia n. sp. C. a1723 
ODONTODIPLOSIS Nl. &. 
This genus is erected for the separation of certain species allied | 
to Cecidomyia, which may be distinguished therefrom by the triartic- 
ulate palpi and the conspicuous serrations on the somewhat conical 
ventral plate or harpes. 
hye CocidOmyia Karmeremeéig rel, C. 27. 
Key to species 
a Fifth antennal segment having the basal portion of the stem with a length 
about 1% greater than its diameter 
b Length .75 mm; abdomen reddish yellow 
(CsCidomyia) karhicremeis Mek, C, 27 
aa Fifth antennal segment having the basal portion of the stem with a length 
2% or 3 times that of the diameter 
) IAGO DAIS OHAIEE ooccosoavecc0ce americana n. sp., C. 451, 660 
bb Abdomen fuscous) yellowisit \sss.55-.eese- 4: MOM PAWS, wh Go, Cy Vis 
nie 
